2015-03-03T23:03:33ZMulti-satellite altimetry and GOCE geoid based surface and subsurface currents in the Mediterranean Seahttp://hdl.handle.net/2117/26437
Title: Multi-satellite altimetry and GOCE geoid based surface and subsurface currents in the Mediterranean Sea
Authors: Martínez Benjamín, Juan José; Chang, Chi-Hung; Kuo, Chung-Yen; Shum, C.K.; Yi, Yuchan2015-02-19T15:48:42ZThe Baleares 2013 Calibration Campaign of Jason-2 and Saral Altimetershttp://hdl.handle.net/2117/26407
Title: The Baleares 2013 Calibration Campaign of Jason-2 and Saral Altimeters
Authors: Martínez Benjamín, Juan José; Frappart, Frédéric; Roussel, Nicolas; Biancale, Richard; Gárate Pasquín, Jorge; Martin Davila, José; Perez, Begoña; Gracia Gómez, Carlos; López Bravo, Rogelio; Tapia Gómez, Ana M.; Gili Ripoll, José Antonio; González González, Juan Carlos; Hernández Pajares, Manuel; Salazar Lino, Mário
Abstract: The 2013 Balearic campaign GNSS position analysis of the 2013 will be performed with different softwares by different groups (similarly as it is being done in
the International GNSS Service for their different products), in order improve the high demanded accuracy for JASON2 and SARAL altimeters precise calibration.
In particular JPL GIPSY-OASIS software will be used, with the undifferenced PPP ambiguity fixing strategy. In order to improve the results accuracy, two similar
networks are being processed. The first network includes the deployed GNSS receivers and the reference stations. The second one is a control network, defined
by using the permanent receivers in the California dense network with a similar distribution as the main altimeter campaign network. In this case, the position of
the receivers plying the role of buoys are being processed in the same kinematic way than the actual buoys, in order to compare them with the very accurate
positions obtained with GIPSY-OASIS static processing.2015-02-18T11:02:28ZBreakwater settlement monitoring with InSAR datahttp://hdl.handle.net/2117/26015
Title: Breakwater settlement monitoring with InSAR data
Authors: Pros, Francesc; González López, Silvia; Martínez Benjamín, Juan José; Palau Teixidó, Vicenç; Duro, Javier
Abstract: This paper presents a use case of the Persistent Scatterer Interferometry (PSI) technique apply to Civil Engineering to monitor the dikes settlement on the Port of Barcelona. A geostatistical analysis of the two available datasets of PSI data have been made on a Geographic Information System to obtain a continuous deformation surface. This approach allows us to study the different subsidence velocities that occur within the sections of the breakwater which are in a different consolidation phase. The two datasets of InSAR data were obtained from different satellites and different time periods so a new methodology was developed for concatenating the two measurements a posteriori. Finally, InSAR and GPS measurement are compared to validate the obtained results.2015-01-21T14:49:11ZImplementation of marine altimeter calibration campaign in the area of Ibiza islandhttp://hdl.handle.net/2117/25913
Title: Implementation of marine altimeter calibration campaign in the area of Ibiza island
Authors: Martínez Benjamín, Juan José; López Bravo, Rogelio; Pérez Gómez, Begoña; Gili Ripoll, José Antonio; Tapia Gómez, Ana M.; González González, Juan Carlos; Sanz Conde, M. Mercedes; Gracia Gómez, Carlos
Abstract: The presentation is directed mainly to the description of the actual situation of the Ibiza site in preparation for a new altimeter calibration marine campaign of Jason-2 and Sara/AltiKa satellites to be made in september 2013. A description of the two geometric levelling campaigns made in June and September 2013 is included2015-01-19T14:30:19ZPreliminary results of the 2013 Ibiza calibration campaign of Jason 2 and Saral altimetershttp://hdl.handle.net/2117/25869
Title: Preliminary results of the 2013 Ibiza calibration campaign of Jason 2 and Saral altimeters
Authors: Frappart, Frédéric; Martínez Benjamín, Juan José; Gracia Gómez, Carlos; López Bravo, Rogelio; Tapia Gómez, Ana M.; Valles Casanova, I. Berenguer; Gili Ripoll, José Antonio
Abstract: This study presents the preliminary results of the 2013 Ibiza calibration campaign of Jason-2 and Saral altimeters. It took place from 14 to 16 September 2013 and was composed of two phases: the calibration of the GNSS buoys to estimate the antenna height of each of them and absolute calibration to estimate the altimeter bias (i.e., the difference of sea level measured by radar altimetry and GNSS). The first one was achieved in the Ibiza harbor at a close vicinity of the Ibiza tide gauge and the second one was at ~ 40 km at the northwest of Ibiza Island at a crossover point of Jason-2 and Saral nominal groundtracks. Five buoys were used to delineate the crossover region and their measurements interpolated at the exact location of each overflight. The overflights occurred two consecutive days: 15 and 16 September 2013 for Jason-2 and Saral respectively. Absolute biases of 0.1 and -4 cm were found for Jason-2 and Saral respectively.2015-01-16T15:57:55ZComparing satellite based and ground based radar interferometry and field observations at the Canillo landslide (Pyrenees)http://hdl.handle.net/2117/24201
Title: Comparing satellite based and ground based radar interferometry and field observations at the Canillo landslide (Pyrenees)
Authors: Corominas Dulcet, Jordi; Iglesias González, Rubén; Aguasca Solé, Alberto; Mallorquí Franquet, Jordi Joan; Fabregas Canovas, Francisco Javier; Planas, Xavier; Gili Ripoll, José Antonio
Abstract: The landslide of El Forn de Canillo in the Principality of Andorra is one of the largest in the Pyrenees. In 2007 a monitoring system (boreholes equipped with inclinometers, extensometers and piezometers) was set up. Between 2010 and 2011, surface displacements were measured using differential interferometry techniques (GB-SAR and DInSAR). The interferograms of both radars have yielded mutually consistent results, compatible with the inclinometric measures. Furthermore, the observations with TerraSAR-X, with greater spatial coverage, have shown that the displacements are significantly higher in the upper part of the slope (up to 4 cm/year). Field surveys evidenced the presence of activity indicators (open tension cracks, ground disturbance and structural damages) that confirm the existence of these movements. In
El Forn landslide, the combined use of radar techniques with conventional instrumentation allows for a more complete and representative interpretation of the behavior of the slope.2014-10-01T18:27:08ZAnálisis de la implantación de una red exprés de autobuses con carril Bus-VAO: caso de la entrada a Barcelona desde el Baix Llobregathttp://hdl.handle.net/2117/23569
Title: Análisis de la implantación de una red exprés de autobuses con carril Bus-VAO: caso de la entrada a Barcelona desde el Baix Llobregat
Authors: Puignau Arrigain, Sara Ahetze; Campos Cacheda, Jose Magin; Lantada Zarzosa, Maria de Las Nieves
Abstract: Los autobuses exprés están siendo una solución acertada en distintas ciudades europeas para cubrir la movilidad ocupacional interurbana. En el caso de Cataluña, han sido en la actualidad tema de controversia la necesidad y el funcionamiento de este tipo de redes y los carriles de priorización que las conforman para que realmente descongestionen las vías perjudicadas y nuevos usuarios opten por cambiar a este modo de transporte. Es por ello que, tomando la perspectiva del usuario y su principal motivo de elección de modo, el tiempo de viaje, se ha querido contribuir a caracterizar, con este estudio concreto
sobre el corredor del Baix Llobregat a Barcelona, en qué medida mejoran los tiempos de recorrido los autobuses exprés y sus alimentadores, los distintos tipos de carriles y la priorización de los distintos modos, parámetro definitorio considerado relevante y
subestimado en este tipo de actuaciones. Con la actuación óptima inferida, los tiempos de viaje en autobús quedan reducidos más de
5 minutos para todos los municipios de estudio, con incluso disminuciones de media hora para algunos de ellos. Las diferencias de tiempo de recorrido entre coche y autobús se atenúan y el coche percibe cambios muy leves de tiempos de recorrido. El vehículo de alta
ocupación (VAO) tendría mejoras despreciables de 5 minutos en tiempos de viaje en los mejores casos al beneficiarse del carril Bus-VAO. Así, se ha ideado una metodología para poder extraer conclusiones previas del sentido de una posible actuación en cada contexto.2014-07-18T12:11:45ZAnálisis comparativo del peligro sísmico de Barcelonahttp://hdl.handle.net/2117/22397
Title: Análisis comparativo del peligro sísmico de Barcelona
Authors: Aguilar Meléndez, Armando; Pujades Beneit, Lluís; Ordaz, Mario G.; Barbat Barbat, Horia Alejandro; Lantada Zarzosa, Maria de Las Nieves; García Elías, Alejandro; Campos, Amelia2014-03-26T18:25:30ZExperiences on altimeter calibration at Ibiza island and Cape of Begur (Spain)http://hdl.handle.net/2117/21990
Title: Experiences on altimeter calibration at Ibiza island and Cape of Begur (Spain)
Authors: Martínez Benjamín, Juan José; Martínez-García, Marina; Ortiz Castelló, Miquel Angel; Talaya, Julia; Baron, Anna; Rodríguez Velasco, G.; Martin Davila, José; Bonnefond, Pascal; Gárete-Martín, Jorge; García, Cristina
Abstract: Three preliminary camp aigns for TOPEX /POSEIDON (T/P) wer e made in March 1999 and July 2000 and for JASON-1 in August 2002, in the NW Mediterran ean Sea at th e Begur Cape area. Dir ect abso lute altimeter calibration , and mapping of the sea surface, w ere made in these camp aigns from dir ect overflights using GPS buoys with a toroidal design performed at the I CC based in the orig inal design of the Univ ersity of Colorado at Boulder and a estimation of the TOPEX A lt- B bias w as made. A Spanish JASON-1 geoid gradien t campaign with Fench support has been made in June 2003 at the Ibiza island in the NW Mediterr anean Sea. Th e main objectiv e has b een to map w ith a new d esign ed, builded and calibrated GPS catamar an, the lo cal geoid gradien t in three ar eas around Ibiza island under the ascending (187) and descending (248) Jason-1ground tracks. The catamaran equ ipped with two GPS antennas to perform continuous sea lev el measur ements was towed by the Patro l Dev a from th e Span ish N avy. Five GPS reference stations were dep loyed on Ibiza island: one in Portinatx, two in San Anton io and two in Ibiza. The marin e geo id has been used to relate the coastal tide gauge data from Ibiza and San An tonio h arbours to off- shore altimetric data. In th e framework of the campaign, the levelling of the Ibiza and San Anton io tide gauges to the r espective GPS mark ers w as p erformed. We present synth esis of the resu lts obtained from Topex/Poseidon and th e first r esults on Jason-1 altimeter calibration using the direct measurements from GPS buoys and the derived marin e geoid. Th e Ibiza results agree relativ ely w ell with resu lts ob tained at Corsica, Harvest and Bass Strait calibration permanen t sites. Moreov er, the geod etic activities (e.g., GPS, levelling) has p ermitted to build a very accurate (few mm) local n etwork link ed to th e European one, w ith a reference frame compatible with th e satellite altimetry missions (ITRF2000). The GPS kinematic data wer e processed using two d ifferen t sof twar es allowing to check th e consistency of the solutions. A perspective of a new Jason-1, in cluding Envisat, Ibiza campaign to be made around 2007 will be pr esen ted. These camp aigns w ere supporte by th e Span ish Ministery of Scien ce and Technology under projects of the N ational Space Program ref : ESP1997-1816-CO4- 03 and ESP2001-4534-PE.2014-03-11T12:33:09ZSome suggestions about satellite and airbone gravimetry geiod determination in the western Mediterranean Seahttp://hdl.handle.net/2117/21988
Title: Some suggestions about satellite and airbone gravimetry geiod determination in the western Mediterranean Sea
Authors: Martínez Benjamín, Juan José; Termens Perarnau, Assumpció
Abstract: This paper will cover a variety of topics. First, it will overview the concepts of GRACE and GOCE
satellite missions. Second, it will summarise some results of the assessment of the recent Earth
global gravity field models, focusing on the study of the differences between satellite altimetry
and tide gauge observations. Third, it will describe the computation and evaluation of a new geoid
model for the Western Mediterranean area in the near future. All three topics will be set in the
framework of the existing data and how airborne gravimetry can contribute.
With the increased interest in coastal zone mapping because of threats like sea level change,
airborne gravimetry can bridge the gap between land and satellite-altimeter-derived gravity data.
As such, a proposal will be made to collect airborne gravimetry in key Mediterranean coastal
zones.2014-03-11T11:20:44ZGeodetic infrastructure in the Barcelona and l’Estartit harbours for sea level monitoringhttp://hdl.handle.net/2117/21986
Title: Geodetic infrastructure in the Barcelona and l’Estartit harbours for sea level monitoring
Authors: Martínez Benjamín, Juan José; Bosch, Ernest; Pérez Gómez, Begoña; Martínez de Osés, Francesc Xavier; Gili Ripoll, José Antonio; Tapia Gómez, Ana M.; González González, Juan Carlos; Sanz Conde, M. Mercedes; López Bravo, Rogelio; Pros Llavador, Francesc2014-03-11T09:44:40ZGeodetic infraestructure in the Ibiza and Barcelona harbours for sea level monitoringhttp://hdl.handle.net/2117/21509
Title: Geodetic infraestructure in the Ibiza and Barcelona harbours for sea level monitoring
Authors: Martínez Benjamín, Juan José; Gili Ripoll, José Antonio; López Bravo, Rogelio; Tapia Gómez, Ana M.; Pérez Gómez, Begoña; Gracia Gómez, Carlos; Pros Llavador, Francesc; Palau Teixidó, Vicenç
Abstract: The presentation is directed to the description of the actual situation and relevant information of the geodetic infrastructure of Ibiza and Barcelona sites for sea level determination and contribution to regional sea level rise. Time series are being analysed for mean sea level variations www.puertos.es. .In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge Datamar 2000C from Geonica s.l. near an acoustic tide gauge. Puertos del Estado installed in 2007 a MIROS radar tide gauge and the Barcelona Harbour Authority a GPS referente station in the roof of the new Control Tower situated in the Energy Pier. The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e-mail. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Precision levelling has been made several times in the last two years because the tower is founded in reclaimed land. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. A description of the actual infrastructure at Ibiza harbour at Marina de Botafoch, is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. It is described the geometrical precision levelling made in June 2013 between the radar tide gauge and the GPS station. In particular, the CGPS located at Ibiza harbour is essential for its application to the marine campaign Baleares 2013, near Ibiza island. The main objective is to determine the altimeter bias for Jason-2, about 9:09 UTC September 15, 2013, and Saral/AltiKa, about 05:30 UTC September 16, UTC. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish National Project CGL2009-13435/CLI.2014-02-11T12:28:15ZControl del asentamiento de los diques este y sur del Puerto de Barcelona mediante datos InSARhttp://hdl.handle.net/2117/21191
Title: Control del asentamiento de los diques este y sur del Puerto de Barcelona mediante datos InSAR
Authors: Martínez Benjamín, Juan José; Pros Llavador, Francesc; González López, Silvia
Abstract: [CASTELLÀ] En este artículo se estudia la viabilidad del uso de InSAR en el control del asentamiento de los diques de reciente
construcción en el Puerto de Barcelona. El análisis se realizó a partir de datos obtenidos mediante Persistent Scatterer
Interferometry (PSI) validándose con datos obtenidos mediante GPS. El uso de satélites de alta resolución permite
obtener una gran densidad de puntos en estas infraestructuras de carácter lineal, facilitando un análisis muy detallado
del movimiento que se produce. Aunque su uso en el control de infraestructuras está limitado por la disponibilidad de
las imágenes, no permitiendo su uso como sistema de control único. [ANGLÈS] In this paper we study the feasibility of using InSAR in monitoring the settlement of newly built dikes in the Port of
Barcelona. The analysis was performed using data obtained by Persistent Scatterer Interferometry (PSI), GPS
measures was used to validate PSI data. The use of high-resolution satellites allows a high density of points in these
linear nature infrastructures, providing a very detailed analysis of the movement that occurs. Although its use in the
control infrastructure is limited by the availability of the images, not allowing use as a unique control system.2014-01-09T12:09:33ZBaleares 2013 Calibration Campaign for Jason-2 and Saral/AltiKahttp://hdl.handle.net/2117/20489
Title: Baleares 2013 Calibration Campaign for Jason-2 and Saral/AltiKa
Authors: Martínez Benjamín, Juan José; Biancale, Richard; Martín Dávila, José; Gárate Pasquín, Jorge; Pérez Gómez, Begoña; Gili Ripoll, José Antonio; López Bravo, Rogelio; Tapia Gómez, Ana M.; Gracia Gómez, Carlos; Frappart, Frédéric; Roussel, Nicolas
Abstract: A Baleares calibration campaign in Spanish-French cooperation is being prepared for mid September 2013 for the altimeters of Jason-2 and Saral/AltiKa in the Ibiza island area. A similar Spanish/French experience with Jason-1 was made in June 2003 in this geographical area under IBIZA 2003 campaign.
In this local/regional campaign focusing in bias, we foresee to calibrate the altimeter of Jason-2 and Saral satellites by means of GPS buoys. 4 buoys will be used near a node from Jason-2 (September 15 about 9:38 in ascending track) and Saral (September 15 about 7:30 in ascending track) satellites to get the slope of the sea in along track and cross track directions, what is necessary to interpolate the exact nadir point of the satellite. It will be used Argos floating transmitters from CLS to be tied to the buoys with a long rope. We have thought over different configurations. The crossover point between Jason-2 and Saral North of Ibiza (around 40 nm) and West of Mallorca island seems to be optimal in order to have a comparable layout of buoys at the same place for both satellites, of couse at one day interval. This would allow moreover cross calibration between Jason2 and Saral. The GPS receivers will be at 1Hz. It will be used the CGPS at Ibiza harbour from Puertos del Estado. A description of the actual geodetic infrastructure of Ibiza site will be presented.
This campaign Baleares 2013 is founded from the Ministerio de Ciencia e Innovacion of Spain under National Project I+D+i ref:CGL2009-13435/CLI.2013-10-29T09:56:49ZMonitoring sea level by tide gauges and GPS at Barcelona and Estartit harbourshttp://hdl.handle.net/2117/20454
Title: Monitoring sea level by tide gauges and GPS at Barcelona and Estartit harbours
Authors: Martínez Benjamín, Juan José; Gili Ripoll, José Antonio; López Bravo, Rogelio; Bosch, Ernest; Perez, Begoña; Pros, Francesc
Abstract: The presentation is directed to the description of the actual situation of the geodetic infrastructure of Barcelona
and l’Estartit sites for sea level determination and contribution to regional sea level rise2013-10-24T12:07:34Z